Here are the dangers — click here to read the rules of survival, from MountEverest.net:

Fear nothing except fear itself. Still, there are some if’s and but’s to this golden rule. The following are some of the mishaps that we have faced during our 4 years of Everest attempts:

• Avalanches
• Falling rocks
• Crevasse falls
• Other falls (including getting hit by falling climber)
• Severe exhaustion/dehydration
• Whiteout
• Hurricane at 8600 m / 27000 ft
• Lost tents
• Frostnip
• AMS
• Pneumonia
• Tropical and all kinds of other infections
• To the above; witnessing accidents and deaths of other climbers.

The death percentage on Everest is currently around 5%. You can do a lot to minimize the statistics for yourself.

First from all, no mountain is safe. The Mount Blanc area suffers 50-60 deaths every year.

All mountains are unpredictable and sometimes terribly unforgiving to negligence. Beware! Take control of your situation on Everest like on any mountain; by being sensible and well prepared.

Ugh.  Even being sensible and prepared can only get you so far. You have to have good luck and good weather on your side.